yes its normal that the mobile opens when u remove the battery and then put it again...dont worry its nothing but dont take off the cover and the battery..try not to remove them at all...why u want to remove it ..clean it..?...once in a month....try not to remove the battery and ur amazing s3 will work great

At first the phone's performance was great but after a few months the phone started to lag and hang a lot and the screen freezes. The battery life isn't reliable either... I would rate this phone as 4/10

1.) The area where you use the phone had no 3G signal.
2.) "Setting" Go to setting - more setting - mobile network - Network mode - change to WCDMA only (if you phone show no signal mean there is no 3G signal in that area.

If your setting are at GSM/WCDMA (Automode) mean the phone will connect to which ever stronger signal eg. if GSM signal is strong it will connect to edge or if WCDMA signal is stronger it will connect to 3G/HSPDA+

One of the worst mobiles I ever had. Exceptionally poor battery life tops 24 hours - with all the features disabled, low screen resolution and in power saving mode. Constantlty looses Network (get message not registered on network) and this phone keep the record of times it completely froze. What a disappointment!